Abstract: The Urumqi-Yuli highway is an important channel connecting the north and south of the Tianshan Mountains. When the highway crosses the Tianshan Mountainsa, a lot of engineering slopes along the highway will be cut. How to quickly and accurately evaluate the stability of these existing slopes and access the influence on slopes by subsequent changes in the process of construction in the alpine region, would directly relate to the route selection, total engineering volume and the amount of investment estimation. Based on rock mass basic quality, a status quo slope quality evaluation system (TBQ) is established. In TBQ, the combining of rock mass discontinuity and slope free surface, the hydrologic condition are selected as the main factors to revise the existing rock mass quality evaluation system. On this basis, other several factors including freezing-thawing and weathering effect caused by the large temperature difference and hydrologic condition, the earthquake and excavation etc., are introduced, the prediction and evaluation system of rock slope stability(TFBQ) is established. Case application to a practical engineering shows that this system is applicable to evaluate and predict the slope stability in project area, and better results are obtained.

Key words: alpine zone, freezing-thawing slope, rock mass quality, evaluation system